Pyrargyrite
Chemical Formula	Ag3SbS3
Species	Sulfides
Crystal System	Trigonal
Mohs Scale	2
Specific Gravity	5.855
Color	Deep red or red gray
Streak	Purplish red
Luster	Adamantine
Refractive Index	n = 3.084 n = 2.881
Diaphaneity	Translucent
Cleavage	Distinct/GoodDistinct on very imperfect on
Fracture	Irregular/Uneven, Conchoidal
Crystal Habit：Prismatic crystals
Geological Setting：Hydrothermal veins as a late stage, low temperature mineral; also formed by secondary processes.